CN102758224A - Anode effect inhibiting and extinguishing method - Google Patents
Anode effect inhibiting and extinguishing method Download PDFInfo
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- CN102758224A CN102758224A CN2011101098982A CN201110109898A CN102758224A CN 102758224 A CN102758224 A CN 102758224A CN 2011101098982 A CN2011101098982 A CN 2011101098982A CN 201110109898 A CN201110109898 A CN 201110109898A CN 102758224 A CN102758224 A CN 102758224A
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- Prior art keywords
- anode
- anode effect
- effect
- feed opening
- extinguishing
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/20—Automatic control or regulation of cells
Abstract
The invention relates to an anode effect inhibiting and extinguishing method for a prebaked anode electrolyser, comprising the following steps of: determining an anode which is about to generate anode effect; feeding to the anode which is about to generate the anode effect through a feed opening by the electrolyser; and if the anode effect is generated, extinguishing the anode effect by only pressing a local bus in a raising way according to the position of the anode generating the anode effect. In the invention, the generation of the anode effect can be effectively inhibited through targeted local alumina replenishment, and the already generated anode effect can be extinguished by pressing the local bus in the raising way; the generation of the anode effect of the anode appearing with anode effect characteristics can be inhibited through single-point local blanking, thereby preventing the damage of simultaneous feeding of all feed openings on the state of the electrolyser and being favorable to stabilizing the operation of the electrolyser; and meanwhile, the effects of energy saving and consumption reduction can be achieved in such a way that the anode effect can be extinguished by pressing the local bus in the raising way.
Description
Technical field
The present invention relates to a kind of anode effect that is used for prebaked-anode type cell suppresses and the method for extinguishing; Relate in particular to after definite prebaked cell for aluminum-reduction is about to take place the concrete zone of anode effect, how imminent anode effect zone is suppressed and the extinguishing method after the generation anode effect through the local blanking of single-point.
Background technology
The tradition prebaked-anode type cell is predicted the situation of anode electrolytic cell effect according to the signal of integral channel voltage, after doping anode effect, is that whole feed openings carry out the generation that big blanking suppresses anode effect simultaneously through the method that adopts.But in fact the generation of anode effect is at first often on indivedual anodes; All feed openings all carry out the method for blanking, can change the concentration of aluminum oxide in ionogen, make it inhomogeneous on spatial distribution; Increase the aluminum oxide consumption, extreme case can produce deposition on the electric tank cathode surface down.
The tradition prebaked-anode type cell adopts whole lifting to press bus or artificial mode of inserting the effect rod to realize extinguishing of anode effect when anode effect takes place usually.The artificial mode anode effect terminating of inserting the effect rod not only the time go up and lag behind, increase workman's manipulation strength, and along with the increase of aluminium production capacity, the use of effect rod is increasing, as mustn't go to control, will inevitably bring havoc to forest.And whole lifting presses the mode of bus to come anode effect terminating, owing to there is not specific aim, not only causes the waste of energy, and the thermal equilibrium of electrolyzer often is damaged along with the adjustment of whole pole span.
In recent years along with cell dimension constantly becomes big; This traditional do not have anode effect inhibition targetedly and extinguishing method can not adapt to the requirement that novel electrolytic bath is become more meticulous and operates, and also do not meet present society to reducing the target of aluminium electrolysis process energy consumption.It is very important to the technico-economical comparison of further raising aluminium cell with extinguishing method that new anode effect suppresses.
Summary of the invention
Provide a kind of anode effect to suppress and the method for extinguishing for solving the problems of the technologies described above the present invention, purpose is can be after accurately the zone of anode effect will take place positioning instant, through controlled oxidation aluminium single-point blanking device; Realize the specific aim blanking and suppress anode effect; Reduce the generation of anode effect, reduce aluminum oxide consumption, after anode effect takes place; Can realize that the pointed local bus of pressure of lifting comes anode effect terminating, thereby realize save energy consumption.
Suppress and the method for extinguishing for reaching above-mentioned purpose anode effect of the present invention, comprise the steps: to confirm to be about to take place the anode of anode effect; Electrolyzer carries out blanking through feed opening to the anode that is about to take place anode effect; If the generation anode effect is only lifted the local bus of pressure according to the anode position that anode effect takes place and is got final product anode effect terminating.
The described anode of confirming to be about to take place anode effect is meant: the anode to different feed openings are corresponding is divided; According to the distance between anode and the feed opening; The ionogen gradient successively decreases around the feed opening; Through the corresponding anode of different feed openings is carried out weighting, after the ratio of quantity greater than regulation of anode effect characteristic appears in the anode of different feed openings correspondences, can confirm as the feed opening position that suppresses the anode effect generation and need carry out alumina blanking.
It is 1 that anode effect characteristic value appears in described anode, and it is 0 that anode effect celebrating characteristic value does not appear in anode, the anode summation corresponding to each feed opening; If the feed opening discrimination threshold is P; 0 < P ≤1; Judge the corresponding anodic of each feed opening and divided by corresponding anode number of each feed opening and the size between the P; If the corresponding anodic of each feed opening and divided by the corresponding anode number of each feed opening greater than P, this feed opening need carry out alumina blanking so, blanking quantity is for suppressing the minimum that anode effect takes place.
Described only lifting according to the anode position that anode effect takes place presses local bus to comprise by anode effect terminating: electrolyzer two side bus are divided into two portions zone at least, and every part is controlled by anode hoister structure separately respectively; Need to confirm the zone of the local moving utmost point; If the characteristic value that anode rod has before anode effect takes place is 1; The characteristic value that anode rod does not have before anode effect takes place is 0, and to the summation of various piece zone, the moving utmost point discrimination threshold of the portion of setting a trap is Q; If the summation of various piece zone greater than Q, then need be lifted and press corresponding local bus.
Advantageous effect of the present invention: can effectively suppress the generation of anode effect and press local bus can extinguish the anode effect that has taken place through lifting through local supplemental aluminium targetedly.The present invention can suppress the generation of anode effect to the anode that the anode effect characteristic occurs through the local blanking of single-point; Avoided the destruction of whole feed openings blanking simultaneously to the electrolyzer state; Help stablizing the electrolyzer operation; Simultaneously, press local bus to come anode effect terminating can reach energy-saving and cost-reducing effect through lifting.
Description of drawings
Fig. 1 confirms electrolyzer feed opening and the concrete synoptic diagram of feed opening.
Fig. 2 is that the local bus of electrolyzer is divided synoptic diagram.
Embodiment
One, at first through being installed in the voltage signal acquisition device on the anode electrolytic cell guide rod; Obtain anode rod equidistance pressure drop signal in real time; Through the computing of data handler, according to anode effect preceding characteristic taking place, finds the anode that is about to take place anode effect then.
Concrete grammar is following:
Step 1: the pre-treatment of data.The pre-treatment of antianode guide rod equidistance pressure drop data is to each anode rod of electrolyzer, and the anode rod equidistance pressure drop raw data of intercepting time span for
carried out the data pre-treatment; Treatment process adopts following smoothing formula to carry out, and realizes that formula is following with the removal of shaking of the unusual pin in the signal:
Wherein
is the smooth value of
;
is the raw data acquisition value; 2 of the beginnings of data and last 2 difference are only used first in the above-mentioned formula group; The the second and the four, the five liang of formula calculated.
Step 2: low-pass filtering treatment.Anode rod equidistance pressure drop data after handling is carried out LPF be meant the filtering of employing Butterworth bilinearity, frequency filtering upper limit default value is 1/600Hz.
Step 3: the shake of high frequency pin is handled.The LPF data that obtain are carried out high frequency pin shake respectively to be handled and is meant time span
is divided into 5 equal portions; Anode rod equidistance pressure drop pin shake intensity in being calculated as follows each cycle
, formula is following:
;
Then the following formula for each time period on the strength of the needle shock smoothed;? ?
, where
; forecast in the current cycle
the needle seismic intensity
; wherein
,
equipartition time period in each of the original anode rod isometric maximum and minimum pressure drop,
are in each period of the low pass filtered equidistant anode rod pressure drop.
Step 4: slope is handled.The LPF data that obtain are carried out the slope processing respectively be meant that anode rod equidistance pressure drop slope is the mean change speed of the anode rod equidistance pressure drop behind the process LPF in a predetermined period
time period; Equally time span
is divided into 5 equal portions, then the slope calculating formula of cycle each anode rod equidistance pressure drop of
inner anode is:
。
Step 5: the accumulative total slope is handled.The LPF data that obtain are added up slope respectively to be handled and to be meant through following formula and to calculate:
Step 6: be about to take place the judgement of anode effect.The data that the shake of high frequency pin is handled, slope is handled and add up after slope is handled are meant slope through the anode effect juggling again; Accumulative total slope and the shake of high frequency pin are provided with threshold value; Significantly increase if anode rod equidistance pressure drop accumulation continuous some cycles of slope continue to descend, anode rod equidistance this cycle of pressure drop slope declines to a great extent or anode rod equidistance pressure drop high frequency pin shakes, then judge to be about to take place anode effect.
Two, confirm that according to following method needs replenish blanking and suppress the feed opening that anode effect takes place.
Method is following:
Step 1: at first confirm that according to the electrolyzer original design the type electrolyzer has the particular location of how many feed openings and these feed openings.
Be that example describes below with Fig. 1.
Step 1: A1-A14 among Fig. 1 and B1-B14 are anode, and being divided into is 4 feed openings, is respectively A, B, C and D feed opening.
Step 2: confirm the anode that each feed opening is responsible for according to the distance of each anode and feed opening, and mark off set.If promptly indivedual guide rods have the characteristic of anode effect, need which feed opening blanking to suppress anode effect so.Consider feed opening and each anodic position relation, the anode that each feed opening is responsible for has carried out following division:
A={A1,A2,A3,A4,B1,B2,B3,B4}
B={A4,A5,A6,A7,A8,B4,B5,B6,B7,B8}
C={A7,A8,A9,A10,A11,B7,B8,B9,B10,B11}
D={A11,A12,A13,A14,B11,B12,B13,B14}。
Step 3: owing to around each feed opening, should have the alumina concentration gradient descending, therefore according to the distance of anode and feed opening, consider the distribution situation of alumina concentration in ionogen, the anode that each feed opening is responsible for carries out the correction of weight.
Situation is following:
A={K1*A1,K2*A2,K2*A3,K1*A4,K1*B1,K2*B2,K2*B3,K1*B4}
B={K1*A4,K2*A5,?K3*A6,K2*A7,K1*A8,K1*B4,K2*B5,?K3*B6,K2*B7,K1*B8}
C={K1*A7,K2*A8,?K3*A9,K2*A10,K1*A11,K1*B7,K2*B8,?K3*B9,K2*B10,K1*B11}
D={K1*A11, K2*A12, K2*A13, K1*A14, K1*B11, K2*B12, K2*B13, K1*B14}; K1 wherein, K2, K3 is respectively weight, K1, K2, K3 get 0.9,0.95,1 respectively.
Step 4: on behalf of corresponding guide rod, A1 ~ A14 in step 3, B1 ~ B14 whether have the characteristic before anode effect takes place respectively.If it is 1 that the so corresponding value of characteristic is arranged, otherwise value is 0.To each A, B, C, four set of D are sued for peace, and promptly calculate sum (A) respectively, sum (B), sum (C) and sum (D).
Step 5: establishing the feed opening discrimination threshold is P, 0 < P ≤1.Judge sum (A)/M1>P, sum (B)/M2>P, sum (C)/M2>P, sum (D)/M1>whether P set up.M1=8 wherein, M2=10, the anode quantity that promptly different feed openings are responsible for, the different structure electrolyzer can be handled by this method equally.This feed opening need carry out alumina blanking if set up so, and blanking quantity is for suppressing the minimum that anode effect takes place.
Step 6:, after anode effect has taken place, confirm how to lift the local bus of pressure and come anode effect terminating according to following step if can't suppress the generation of anode effect.
Represent one type the local bus dividing condition of electrolyzer like Fig. 2.Be about to original two side bus of electrolyzer and be divided into E, F and G three subregions, E={E1 wherein, E2, E3, E4, F1, F2, F3, F4} are the first part zone.F={E5, E6, E7, E8, E9, E10, F5, F6, F7, F8, F9, F10} are the second section zone.G={E11, E12, E13, E14, F11, F12, F13, F14} are the third part zone.
This three part is controlled by anode hoister structure separately respectively, this three part is promoted separately and descends.Dissimilar electrolyzers can according to circumstances carry out different divisions.
Come need to confirm the zone of the local moving utmost point so according to the methods below:
On behalf of corresponding guide rod, step 1:E1 ~ E14, F1 ~ F14 whether have the characteristic before anode effect takes place respectively.If it is 1 that the so corresponding value of characteristic is arranged, otherwise value is 0.To each E, F, three set of G are sued for peace, and promptly calculate sum (E) respectively, sum (F) and sum (G).
Step 2: the moving utmost point discrimination threshold of the portion of setting a trap is Q, generally gets Q=0.Judge sum (E)>Q, sum (F)>Q and sum (G)>whether Q set up.Promptly in different local buses is divided, whether have and have the anode that is about to take place the anode effect characteristic.If set up to lift so and press corresponding local bus.
Step 3: wait for that the anode effect that slot control machine sends indicates,, lift so and press the local bus of confirming in the step 2 to extinguish the anode effect that has taken place if slot control machine is confirmed anode effect has taken place.
Claims (4)
1. anode effect suppresses and the method for extinguishing, and it is characterized in that comprising the steps: to confirm to be about to take place the anode of anode effect; Electrolyzer carries out blanking through feed opening to the anode that is about to take place anode effect; If the generation anode effect is only lifted the local bus of pressure according to the anode position that anode effect takes place and is got final product anode effect terminating.
2. anode effect according to claim 1 suppresses and the method for extinguishing; It is characterized in that the described anode of confirming to be about to take place anode effect is meant: the anode to different feed openings are corresponding is divided; According to the distance between anode and the feed opening; The ionogen gradient successively decreases around the feed opening; Through the corresponding anode of different feed openings is carried out weighting, after the ratio of quantity greater than regulation of anode effect characteristic appears in the anode of different feed openings correspondences, can confirm as the feed opening position that suppresses the anode effect generation and need carry out alumina blanking.
3. anode effect according to claim 2 suppresses and the method for extinguishing, and it is characterized in that it is 1 that anode effect characteristic value appears in described anode, and it is 0 that anode effect celebrating characteristic value does not appear in anode, the anode summation corresponding to each feed opening; If the feed opening discrimination threshold is P; 0 < P ≤1; Judge the corresponding anodic of each feed opening and divided by corresponding anode number of each feed opening and the size between the P; If the corresponding anodic of each feed opening and divided by the corresponding anode number of each feed opening greater than P, this feed opening need carry out alumina blanking so, blanking quantity is for suppressing the minimum that anode effect takes place.
4. anode effect according to claim 1 suppresses and the method for extinguishing; It is characterized in that described only lifting according to the anode position that anode effect takes place press local bus to comprise by anode effect terminating: electrolyzer two side bus are divided into two portions zone at least, and every part is controlled by anode hoister structure separately respectively; Need to confirm the zone of the local moving utmost point; If the characteristic value that anode rod has before anode effect takes place is 1; The characteristic value that anode rod does not have before anode effect takes place is 0, and to the summation of various piece zone, the moving utmost point discrimination threshold of the portion of setting a trap is Q; If the summation of various piece zone greater than Q, then need be lifted and press corresponding local bus.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110109898.2A CN102758224B (en) | 2011-04-29 | 2011-04-29 | Anode effect inhibiting and extinguishing method |
| PCT/CN2012/000554 WO2012146060A1 (en) | 2011-04-29 | 2012-04-25 | Method and equipment for suppressing and extinguishing anode effect |
| CA2834498A CA2834498A1 (en) | 2011-04-29 | 2012-04-25 | Method and apparatus for suppressing and extinguishing anode effect |
| NO20131575A NO20131575A1 (en) | 2011-04-29 | 2013-11-28 | Method and apparatus for suppressing and removing anode power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110109898.2A CN102758224B (en) | 2011-04-29 | 2011-04-29 | Anode effect inhibiting and extinguishing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102758224A true CN102758224A (en) | 2012-10-31 |
| CN102758224B CN102758224B (en) | 2015-02-25 |
Family
ID=47052865
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110109898.2A Active CN102758224B (en) | 2011-04-29 | 2011-04-29 | Anode effect inhibiting and extinguishing method |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN102758224B (en) |
| CA (1) | CA2834498A1 (en) |
| NO (1) | NO20131575A1 (en) |
| WO (1) | WO2012146060A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839145A (en) * | 2016-06-13 | 2016-08-10 | 中南大学 | Non-uniform blanking method for aluminum electrolytic bath |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322861A (en) * | 2001-04-20 | 2001-11-21 | 贵阳铝镁设计研究院 | Automatic anode effect distinguishing method of aluminium electrolyzing production |
| CN101748445A (en) * | 2008-12-08 | 2010-06-23 | 贵阳铝镁设计研究院 | Anode effect sectionalized alarm method and device of electrolytic bath |
| CN201634783U (en) * | 2009-12-17 | 2010-11-17 | 沈阳铝镁设计研究院 | Zone control system for aluminum electrolysis cell |
| CN101967658A (en) * | 2010-11-18 | 2011-02-09 | 北方工业大学 | Aluminum cell anode effect prediction device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3539461A (en) * | 1967-10-19 | 1970-11-10 | Kaiser Aluminium Chem Corp | Anode effect termination |
| SU526683A1 (en) * | 1974-04-22 | 1976-08-30 | Институт Автоматики | Method for automatic quenching of anode effects on aluminum electrolysis cells |
| JPS548109A (en) * | 1977-06-22 | 1979-01-22 | Mitsubishi Keikinzoku Kogyo | Controlling method of feeding alumina into aluminum electrolytic bath |
| US4654130A (en) * | 1986-05-15 | 1987-03-31 | Reynolds Metals Company | Method for improved alumina control in aluminum electrolytic cells employing point feeders |
| EP0353943A1 (en) * | 1988-08-04 | 1990-02-07 | Alcan International Limited | Process for terminating anode effects during the production of aluminum |
| RU2303658C1 (en) * | 2005-11-02 | 2007-07-27 | Общество с ограниченной ответственностью "Русская инжиниринговая компания" | Method for controlling technological process in aluminum cell with roasted anodes |
-
2011
- 2011-04-29 CN CN201110109898.2A patent/CN102758224B/en active Active
-
2012
- 2012-04-25 CA CA2834498A patent/CA2834498A1/en not_active Abandoned
- 2012-04-25 WO PCT/CN2012/000554 patent/WO2012146060A1/en active Application Filing
-
2013
- 2013-11-28 NO NO20131575A patent/NO20131575A1/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322861A (en) * | 2001-04-20 | 2001-11-21 | 贵阳铝镁设计研究院 | Automatic anode effect distinguishing method of aluminium electrolyzing production |
| CN101748445A (en) * | 2008-12-08 | 2010-06-23 | 贵阳铝镁设计研究院 | Anode effect sectionalized alarm method and device of electrolytic bath |
| CN201634783U (en) * | 2009-12-17 | 2010-11-17 | 沈阳铝镁设计研究院 | Zone control system for aluminum electrolysis cell |
| CN101967658A (en) * | 2010-11-18 | 2011-02-09 | 北方工业大学 | Aluminum cell anode effect prediction device |
Non-Patent Citations (1)
| Title |
|---|
| 吴鸿等: "《铝电解工》", 31 December 2006, article "铝电解工", pages: 176 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839145A (en) * | 2016-06-13 | 2016-08-10 | 中南大学 | Non-uniform blanking method for aluminum electrolytic bath |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2834498A1 (en) | 2012-11-01 |
| NO20131575A1 (en) | 2013-11-28 |
| WO2012146060A1 (en) | 2012-11-01 |
| CN102758224B (en) | 2015-02-25 |
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